JP2875209B2 - Rotary feeder - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a method for taking out a suitable amount of compound feed in a hopper and supplying it to a pneumatic transportation line.
It relates to a rotary feeder.

[0002]

2. Description of the Related Art FIG. 7 is a longitudinal sectional view showing a conventional blow-through type rotary feeder, FIG. 8 is a partial longitudinal sectional view taken along the line VIII of FIG. 7, and FIG. 9 is a sectional view taken along the line IX of FIG. This rotary feeder fills a concave portion 21 formed on a peripheral surface of a rotor 2 rotating around a horizontal axis with a compound feed supplied from an upper hopper (not shown) through an upper opening 11 of a casing 1, The compound feed is supplied to the next pneumatic transport line by rotating the rotor 2 so that the concave portion 21 is coincident with or connected to the pneumatic transport pipe 3.

[0003]

In order to feed a compound feed having a large particle diameter, for example, a diameter of 4 to 6 mm by the rotary feeder having the above structure, the compound feed is provided at a position where the peripheral surface of the rotor 2 enters the casing 1. The width and depth of the recess 21 are designed to be larger than the particle size of the compound feed in order to prevent crushing due to biting of the feed. Also,
Conventional rotary feeders have shallow pockets,
Although the opening area is large, the empty volume is small, and in order to secure a sufficient supply capacity, it is necessary to design the rotor diameter to be considerably large.

By the way, in the rotary feeder having the above structure, the concave portion 21 is intermittently connected to the air transport pipe 3, so that the feed mixture is supplied intermittently to the air transport line. Therefore, when the number of the recesses 21 is reduced, the supply of the compound feed to the pneumatic transportation line becomes more timely, and the flow of the compound feed transported through the pneumatic transportation line is periodically shaded. This may increase the risk of blockage of the compound feed at the narrowed portion of the piping constituting the transport line. In order to avoid the risk of this blockage, it is necessary to increase the piping diameter of the pneumatic transportation line, but this leads to a significant cost increase.

On the other hand, when the diameter of the rotor 2 is increased and the number of the recesses 21 is ensured, the pressure receiving area at the lower portion of the rotor 2 is increased.
Is likely to be pushed up and come into contact with the casing 1. In order to avoid this problem, it is necessary to enhance the material strength of the rotating shaft of the rotor 2 and to increase the shaft diameter. For this reason, only the cost increase due to the enlargement of the casing 1 and the rotor 2 is required. However, there is a concern that the filling rate may decrease due to an increase in the peripheral speed due to an increase in the rotor diameter.

[0006]

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned various problems, and the invention according to claim 1 has a cylindrical rotor which rotates around a horizontal axis in a casing. The compounded feed supplied on the peripheral surface of the rotor through the upper opening of the casing is filled into a filling portion formed on the peripheral surface of the rotor, and the filling portion is rotated to rotate the lower air transport pipe. In the rotary feeder that supplies the compound feed to the pneumatic transport line of the next stage by being connected to the above, the filling portion is formed of a concave portion opened in a long hole shape extending in the axial direction in plan view, and the concave portion,
The short diameter and the depth of the opening are set to be larger than the maximum diameter of the compound feed, and a large number of concave portions are formed in a zigzag pattern along the circumferential direction on the peripheral surface of the rotor, and at least one concave portion is formed during rotation of the rotor. It is always arranged to connect to the air transport pipe,
The total opening area is arranged so as to be evenly and continuously distributed in the axial direction, and the opening shape of the upper opening of the casing with respect to the peripheral surface of the rotor is set to a regular square including two sides parallel to the axial direction. The bottom of the recess has a through hole communicating with the side surface of the rotor, and the casing has a compressed air supply passage communicating with the through hole when the recess is connected to the air transport pipe. It is characterized by.

According to a second aspect of the present invention, in addition to the configuration of the first aspect, a portion of the casing which comes into contact with the peripheral surface of the rotor and on which the concave portion rises is formed in a staggered manner. A plurality of exhaust passages are formed at positions that can communicate with the formed recesses.

According to a third aspect of the present invention, in addition to the configuration of the first aspect, the compound feed is instantaneously crushed on the side of the upper opening of the casing with respect to the rotor peripheral surface on the side in the rotation direction of the rotor. A sharp edge is provided for shearing.

According to a fourth aspect of the present invention, in the configuration of the first aspect, all the corners of the concave portion are rounded.

[0010]

FIG. 1 is a longitudinal sectional view showing a blow-through type rotary feeder according to the present invention, FIG. 2 is a partial longitudinal sectional view taken along a line II in FIG. 1, and FIG. 3 is a sectional view taken along a line III in FIG. is there. The casing 1 accommodates a cylindrical rotor 2 that is cantilevered and rotates around a horizontal axis. Casing 1 is
It has an upper opening 11 above the rotor 2 and an air transport pipe 3 below. One end of the air transport pipe 3 is connected to an external air source (not shown), and the other end is connected to a next-stage air transport line. Peripheral surface 22 and side surface 23 of rotor 2
Is in sliding contact with the inner surface 12 of the casing 1 other than the upper opening 11 and the air transport pipe 3.

FIG. 4 is a longitudinal sectional view of the rotor 2, and FIG. 5 is a developed partial view of the peripheral surface 22 of the rotor 2. A large number of recesses 20 are formed on the peripheral surface 22 of the rotor 2. Recess 2
Reference numeral 0 denotes an elongated hole extending in the axial direction X in plan view. Further, the recess 20 is formed such that all corners thereof are rounded. The short diameter H (FIG. 3) and the depth D (FIG. 4) of the opening of the recess 20 are set to be larger than the maximum diameter of the compound feed. The size is set so that the particles are filled.

As shown in FIG. 5, the recess 20 has a peripheral surface 22.
Are formed in a zigzag pattern along the circumferential direction Y. Also,
The recess 20 is formed such that at least one of the recesses 20 is always connected to the air transport pipe 3 during the rotation of the rotor 2. That is, in FIG. 5, when the peripheral surface 22 is divided along the circumferential direction Y by a width y1 equal to the width of the air transport pipe 3,
The recess 20 is provided so that at least one recess is located in each section. Further, the recess 20 has a total opening area in the axial direction X.
Are arranged so as to be evenly and continuously distributed. That is, in FIG. 5, when the peripheral surface 22 having a width in the axial direction X exposed to the upper opening 11 is divided along the axial direction X into, for example, four equal parts with a width x1, the sum of the opening areas of the concave portions 20 in each section Are equal, and no matter how small the circumferential surface 22 is divided along the axial direction X, the opening of the recess 20 is always located in each section, and the opening area of the recess 20 in each section is Are equal to each other.
Specifically, four recesses 20a and 20
b, 20c, and 20d are repeated while maintaining a fixed arrangement relationship. That is, when viewed along the circumferential direction Y, the recess 20a and the recess 20c overlap each other by one third in the axial direction X, and the recess 20b and the recess 20d also overlap by one third in the axial direction X. Are overlapped with each other.
0b is in contact in the axial direction X.

The bottom of the recess 20 has a side surface 2 of the rotor 20.
The through hole 24 opened to 3 is in communication. On the other hand, the casing 1 is formed with a compressed air supply passage 13 that communicates with the through hole 24 when the recess 20 is connected to the air transport pipe 3. The compressed air supply passage 13 is connected to an external compressed air supply source (not shown). In addition, the through-hole 24 is formed as shown in FIG.
As shown in FIG. 1, the compressed air supply passage 13 is formed so as to open to the side surface 23 of the rotor 2 on the side close to the concave portion 20, as shown in FIG. Is formed.

The rotor 2 in the upper opening 11 of the casing 1
The opening shape with respect to the peripheral surface 22 is set to a regular square including two sides parallel to the axial direction X, as shown in FIG.
The length of the side of the upper opening 11 parallel to the axial direction X is set to a size capable of facing the entire opening of the concave portion 20 located at both ends in the axial direction X. Rotation direction A of upper opening 11
On the side, the casing 1
Edge 1 that shears compound feed that is going to sneak into
4 is fixed. FIG. 6 is a schematic longitudinal sectional view showing the edge 14.

The portion of the casing 1 that contacts the peripheral surface 22 of the rotor 2 and on the side where the recess 20 rises, that is, the side portion 15 (FIG. 2) of the casing 1 An exhaust passage 16 is formed at a position where the exhaust passage 16 can be communicated with. The exhaust passage 16 is, as shown in FIG.
It is formed at a predetermined position in the axial direction X of the side portion 15. When the concave portion 20 is provided as shown in FIG.
The circumferential surface 22 is divided into two equal parts along the axial direction X, and when viewed in the circumferential direction Y in each section, the concave part 20 is a position Z at which the adjacent concave parts 20 overlap in the circumferential direction. That is, the exhaust passage 16 is formed at two places.

Next, the operation of the rotary feeder having the above configuration will be described. When the compound feed in the hopper is supplied from the hopper (not shown) installed on the casing 1 through the upper opening 11 onto the peripheral surface 22 of the rotor 2, Formula feed is filled. On the other hand, since the rotor 2 is rotating in the direction A, the concave portion 20 filled with the compound feed sinks into the casing 1, comes to a position facing the air transport pipe 3, and is connected to the air transport pipe 3. As it sinks into the casing 1, the compound feed projecting from the recess 20 is sheared by the edge 14. When the concave portion 20 filled with the compound feed is connected to the pneumatic transport pipe 3, compressed air is supplied to the concave portion 20 through the compressed air supply passage 13 and the through-hole 24 at the bottom thereof, and the concave portion 20 is filled. The feed is pushed by compressed air and the air transport pipe 3
And is transported by air from an air source and supplied to a pneumatic transport line. The concave portion 20 that has been emptied by dropping the compound feed rises with the rotation of the rotor 2, communicates with the exhaust passage 16 on the way to release the pressure in the concave portion 20, and is exposed from the upper opening 11. I do. Then, the feeding of the compound feed is similarly performed by the recess 20 in the same manner.

In the rotary feeder having the above configuration, one recess 20 is always connected to the air transport pipe 3 while the rotor 2 is rotating. Feed is provided. For this reason, the flow of the compound feed transported through the pneumatic transport line via the pneumatic transport pipe 3 is always continuous, and no periodic shading occurs. Therefore, the risk of clogging of the compound feed in the piping constituting the pneumatic transportation line is reduced, and it is not necessary to increase the diameter of the piping. Further, if the rotor 2 is rotated at a high speed, a large amount of the compound feed is continuously supplied to the pneumatic transportation line.

The recess 20 has a total opening area in the axial direction X.
Are arranged so as to be distributed evenly and continuously, so that the compound feed supplied through the upper opening 11 is uniformly supplied by the rotor 2 from any part in the axial direction X, and finally, It is completely supplied without leaving it in the upper opening 11.

Further, since the shape of the upper opening 11 with respect to the peripheral surface 22 is a regular square including two sides parallel to the axial direction X, the feed inlet for the compound feed into the upper opening 11, that is, the rotor 2 becomes large, and the concave portion is formed. Together with the formation of the staggered 20, the filling rate of the compound feed filled in the recess 20 is improved.

In addition, since the corners of the concave portion 20 are all rounded, the compound feed is less likely to remain on the corners. Moreover,
The compound feed in the concave portion 20 connected to the air transport pipe 3 is pushed by the compressed air from the compressed air supply passage 13 and the through hole 24. For this reason, all of the compound feed in the recess 20 falls to the air transport pipe 3 without fail. Therefore, a predetermined amount of the mixed feed is always continuously supplied to the pneumatic transportation line.

Further, since the edge 14 is fixed to the side of the upper opening 11 on the rotation direction A side, the compound feed projecting from the recess 20 is instantaneously sheared by the sharp edge 14 when it sinks into the casing 1. Is done. Therefore, the compound feed is prevented from being bitten between the rotor 2 and the casing 1 and finely crushed.

Further, although the peripheral surface 22 of the rotor 2 has a large number of concave portions 20, the surface itself is not cut off in the axial direction X nor in the circumferential direction Y by the concave portions 20.
Since they are continuous, the sealing performance between the rotor 2 and the casing 1 is good. Therefore, the transport pressure leaking from the gap between the rotor 2 and the casing 1 causes the upper opening 1 to move.
1 is not blown up, and the filling of the concave portion 20 with the compound feed is performed well. In addition, since the air pressure in the concave portion 20 is released from the concave portion 20 in which the transport pressure is stored by being connected to the air transport pipe 3 by the exhaust passage 16, the concave portion 20 is exposed when the concave portion 20 is exposed to the upper opening 11. The compound feed in the upper opening 11 is not blown up by the air pressure in 20, and thus,
The filling of the compound feed into the recess 20 is performed favorably.

[0023]

【The invention's effect】

(1) According to the first aspect of the present invention, since one recess 20 is always connected to the air transport pipe 3 during the rotation of the rotor 2, the compound feed is continuously supplied to the air transport pipe 3. Can,
Periodic shading can be prevented from occurring in the flow of the compound feed in the pneumatic transportation line. Therefore, blockage of the compound feed in the pneumatic transportation line can be prevented, and the pipe diameter can be designed smaller than before.

The recess 20 has a total opening area in the axial direction X.
Are arranged so as to be evenly and continuously distributed, so that the compound feed can be completely transported without finally being left in the upper opening 11.

The opening shape of the upper opening 11 with respect to the peripheral surface 22 is a regular rectangle including two sides parallel to the axial direction X.
In addition to the fact that the concave portions 20 are arranged in a staggered manner, the amount of the compound feed fed into the rotor 2 can be increased, and the filling rate of the compound feed by the rotor 2 can be improved.

Further, the compound feed in the recess 20 connected to the air transport pipe 3 is reliably dropped by the compressed air from the through hole 24 into the air transport pipe 3 immediately below the rotor 2, and The compressed air can be conveyed to a downstream pneumatic transportation line connected to the rotary feeder.
Therefore, it is possible to always continuously supply a predetermined amount of the compounded feed to the pneumatic transportation line.

Furthermore, since the peripheral surface 22 of the rotor 2 is continuous in the axial direction X and the circumferential direction Y, the sealing performance between the rotor 2 and the casing 1 can be improved. Therefore, it is possible to prevent the compound feed in the upper opening 11 from being blown up by the transport air leaking from between the rotor 2 and the casing 1, and the concave portion 20 of the compound feed can be prevented.
Can be satisfactorily filled.

(2) According to the second aspect of the present invention, the air pressure can be released from the concave portion 20 in which the transport air is stored by the exhaust passage 16, so that the concave portion 20 is exposed to the upper opening 11. In addition, it is possible to prevent the compound feed in the upper opening 11 from being blown up by the air pressure in the recess 20. Therefore, also in this case, it is possible to satisfactorily fill the concave portion 20 with the compound feed.

(3) According to the third aspect of the invention, it is possible to prevent the compound feed from being caught between the rotor 2 and the casing 1 to generate powder.

(4) According to the fourth aspect of the present invention, it is possible to prevent the compound feed from remaining on the corners of the recess 20. Therefore, in combination with the compressed air supplied to the bottom of the concave portion 20, all of the compound feed can be reliably dropped from the concave portion 20 to the air transport pipe 3.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing a rotary feeder of the present invention.

FIG. 2 is a partial vertical sectional view taken along the arrow II in FIG. 1 of FIG.

FIG. 3 is a view taken in the direction of the arrow III in FIG. 1;

FIG. 4 is a longitudinal sectional view of a rotor.

FIG. 5 is a development partial view of a peripheral surface of a rotor.

FIG. 6 is a schematic longitudinal sectional view showing an edge.

FIG. 7 is a longitudinal sectional view showing a conventional rotary feeder.

8 is a partial vertical sectional view taken along the arrow VIII of FIG. 7;

9 is a view taken in the direction of the arrow IX in FIG. 7;

[Explanation of symbols]

 Reference Signs List 1 casing 11 upper opening 13 compressed air supply passage 14 edge 16 exhaust passage 2 rotor 20 concave portion 22 peripheral surface 24 through hole 3 air transport pipe

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁶ , DB name) B65G 65/48

Claims (4)

(57) [Claims] 1. A casing provided with a cylindrical rotor rotating around a horizontal axis in a casing, and a compound feed supplied to the peripheral surface of the rotor through an upper opening of the casing is filled on a peripheral surface of the rotor. In the rotary feeder that supplies the compounded feed to the next pneumatic transportation line by rotating the rotor and connecting the filling part to the lower pneumatic transportation line, the filling part is viewed in a plan view. It consists of a long hole-shaped recess that extends in the axial direction, and the short diameter and depth of the opening of the recess are set to be larger than the maximum diameter of the compound feed, and the recess is circumferentially formed on the rotor peripheral surface. Are formed in a zigzag pattern along the axis, at least one of them is arranged so as to be always connected to the air transport pipe during the rotation of the rotor, and the total opening area is arranged so as to be uniformly and continuously distributed in the axial direction. The opening shape of the upper opening of the casing with respect to the rotor peripheral surface is set to a regular square shape including two sides parallel to the axial direction, and a through hole opened on the side surface of the rotor communicates with the bottom of the concave portion. A rotary feeder, wherein a compressed air supply passage communicating with the through hole when the recess is connected to the air transport pipe is formed in the casing. 2. A plurality of exhaust passages opened at positions where the casing is in contact with the rotor peripheral surface and on the side where the recesses rise, at positions where they can communicate with the rising staggered recesses. The rotary feeder according to claim 1, wherein 3. A sharp edge for instantaneously shearing a compound feed without crushing the compound feed on a side of the upper opening of the casing with respect to a rotor peripheral surface on a rotor circumferential side. Rotary feeder. 4. The rotary feeder according to claim 1, wherein all the corners of the recess are rounded.